Interesting…VLAN 1 is the default LAN and you can see that all active interfaces are assigned to VLAN 1.

VLAN information is not saved in the running-config or startup-config but in a separate file called vlan.dat on your flash memory. If you want to delete the VLAN information you should delete this file by typing delete flash:vlan.dat. I configured an IP address on H1 and H2 so they are in the same subnet.

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By default the native and default VLAN is both VLAN 1 which you can’t delete. If your switchport is assigned to any VLAN which you delete then it will just “float” around in no man’s land…it won’t be assigned automatically to another VLAN.

On 802.1Q trunk links, we can send tagged and untagged Ethernet frames. Frames that are untagged are considered to belong to the native VLAN. It is possible to configure your switches to tag the native VLAN btw.

On the native VLAN, you’ll find frames from protocols like CDP, DTP, etc.

On 802.1Q trunk links, we can send tagged and untagged Ethernet frames. Frames that are untagged are considered to belong to the native VLAN. It is possible to configure your switches to tag the native VLAN btw.

There are advantages and disadvantages to creating a trunk between the Router and the Cisco 3850 switch. It all depends on what you want to achieve.

You would want to do this if:

you want all of the routing of your network to take place at the Router
a) advantages of this include: to be able to apply security, access lists and other policies at a single location
b) disadvantages include single point of failure for routing

if you want to allow VLANs to span multiple areas of your network (if the Router is a layer 3 switch)

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